feat: large polish pass — UX fixes, per-chat scope, restore/backup, action events

Backend
- Per-chat album scope for Immich commands (search/latest/memory/...): new
  allowed_album_ids on CommandTrackerListener, threaded listener/page kwargs
  through ProviderCommandHandler.handle; PATCH listener-scope endpoint.
- /search and /find accept a trailing page number; Immich client search_smart
  / search_metadata take a page param.
- Immich person-asset lookup switched from removed GET /api/people/{id}/assets
  to POST /api/search/metadata with personIds (fixes /person command and
  auto_organize rules silently returning zero candidates on Immich 1.106+).
- Auto_organize rule now sets the target album's thumbnail to the first added
  image when missing (falls back to any asset type); failures do not fail the
  rule. add_assets_to_album surfaces the Immich error body on non-2xx.
- EventLog.user_id / action_id / action_name columns with defensive migration
  + backfill. Status query filters by user_id directly; Immich/webhook paths
  emit user_id explicitly. action_runner writes an action_success/partial/
  failed event on each non-dry-run.
- Dashboard DELETE /api/status/events (scoped to user_id) + rendering live
  tracker/provider/action names via FK join with snapshot fallback.
- PATCH /api/users/{id} for username/role change with last-admin guard.
- Deletion protection returns structured {message, entity, blocked_by}
  (ApiError carries .blockedBy; frontend opens BlockedByModal).
- Backup prepare-restore → AppSetting markers + atomic write of
  pending_restore.json; lifespan hook applies on next startup and archives
  under data/applied_restores/. apply-restart sends SIGTERM so the lifespan
  shutdown runs; NOTIFY_BRIDGE_SUPERVISED env override gates the button.
  Manual POST /api/backup/files (same format as scheduled).
- New periodic-summary test path reuses shared collect_scheduled_assets
  (limit=0) so test and future production code go through one primitive.
- Per-receiver locale for Telegram test messages (resolves
  TelegramChat.language_override per chat instead of applying the first
  receiver's locale to everyone).
- Bounded concurrency (semaphores) in NotificationDispatcher._preload_asset_data
  and _refresh_telegram_chat_titles; chat title sweep extended to 24h since
  save_chat_from_webhook covers active chats opportunistically.
- Telegram poller detects the \"webhook is active\" 409 and auto-calls
  deleteWebhook for bots whose DB update_mode is polling (throttled per bot).
- TelegramClient.get_chat added (CLAUDE.md rule 6); set_album_thumbnail added.
- Seeds: rename \"Default Commands\" → \"Default Immich Commands\";
  track_assets_removed default False.

Frontend
- Global provider selector visible when there is only one provider.
- Clear-events button + i18n + ConfirmModal on the dashboard; new icons/
  labels/filters/colors for action_success / action_partial / action_failed.
- Auto-select first available tracking/template/command/config + bot on
  create forms (trackers, command-trackers, targets, template/command
  configs).
- Telegram target disable_url_preview defaults to true.
- BlockedByModal wired into 8 deletion flows; fetchAuth helper for
  multipart/binary calls (reuses api()'s refresh + ApiError mapping).
- Immich tracker 'Checking links' parallelised (concurrency cap 6).
- Backup page: pending-restore banner + Apply-now / Apply-later modal,
  restarting overlay polling /api/health, manual 'Create backup' button.
- Command-trackers listener row gets an 'Edit album scope' modal with
  inherit/explicit multiselect.
- Users page: Edit user modal (username + role).
- parseDate helper for consistent UTC date rendering.

Migrations / schema
- event_log: + user_id, action_id, action_name (+ backfill user_id from
  notification_tracker).
- command_tracker_listener: + allowed_album_ids.

frontend/src/routes/notification-trackers/+page.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import { api } from '$lib/api';
+	import { api, parseDate } from '$lib/api';
 	import { t, getLocale } from '$lib/i18n';
 	import { providersCache, targetsCache, trackingConfigsCache, templateConfigsCache, capabilitiesCache } from '$lib/stores/caches.svelte';
 	import PageHeader from '$lib/components/PageHeader.svelte';
@@ -136,10 +136,29 @@
 		if (showForm && form.provider_id && form.provider_id !== _prevProviderId) {
 			_prevProviderId = form.provider_id;
 			loadCollections();
+			// Auto-select first available tracking/template config for this provider when creating
+			if (editing === null) {
+				const ptype = providers.find(p => p.id === form.provider_id)?.type || '';
+				if (ptype) {
+					if (!form.default_tracking_config_id) {
+						const first = trackingConfigs.find(c => c.provider_type === ptype);
+						if (first) form.default_tracking_config_id = first.id;
+					}
+					if (!form.default_template_config_id) {
+						const first = templateConfigs.find(c => c.provider_type === ptype);
+						if (first) form.default_template_config_id = first.id;
+					}
+				}
+			}
 		}
 	});
 
-	function openNew() { form = defaultForm(); editing = null; showForm = true; collections = []; previousCollectionIds = []; }
+	function openNew() {
+		form = defaultForm();
+		// Auto-select first provider if any
+		if (providers.length > 0) form.provider_id = providers[0].id;
+		editing = null; showForm = true; collections = []; previousCollectionIds = [];
+	}
 
 	async function edit(trk: Tracker) {
 		form = {
@@ -256,7 +275,7 @@
 	function formatDate(dateStr: string): string {
 		if (!dateStr) return '';
 		try {
-			const d = new Date(dateStr);
+			const d = parseDate(dateStr);
 			return d.toLocaleDateString(undefined, { month: 'short', day: 'numeric', year: 'numeric' });
 		} catch (e) { console.warn('Date format error:', e); return ''; }
 	}